US20120213194A1 - System and method for mobile communications - Google Patents
System and method for mobile communications Download PDFInfo
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- US20120213194A1 US20120213194A1 US13/458,763 US201213458763A US2012213194A1 US 20120213194 A1 US20120213194 A1 US 20120213194A1 US 201213458763 A US201213458763 A US 201213458763A US 2012213194 A1 US2012213194 A1 US 2012213194A1
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/04—Wireless resource allocation
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/20—Control channels or signalling for resource management
- H04W72/21—Control channels or signalling for resource management in the uplink direction of a wireless link, i.e. towards the network
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/50—Allocation or scheduling criteria for wireless resources
- H04W72/51—Allocation or scheduling criteria for wireless resources based on terminal or device properties
Abstract
Description
- The following relates to systems and methods for mobile communications.
- Data transmission rates for mobile devices have increased in part due to the development of networks. One such development is the Enhanced Data Rates for GSM Evolution (EDGE), also known as Enhanced GPRS (EGPRS). It is a backward-compatible digital mobile phone technology that allows for improved data transmission rates as an extension on top of standard Global System for Mobile communications (GSM).
- As another upgrade to both GSM and EDGE, the introduction of EDGE Evolution or Evolved EDGE will further increase data transmission rates. One such feature of Evolved EDGE is the Downlink Dual Carrier (DLDC), which allows a mobile device to receive data on two different frequency channels at the same time, doubling the downlink throughput.
- Embodiments will now be described by way of example only with reference to the appended drawings wherein:
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FIG. 1 is a schematic diagram illustrating a mobile device exchanging data on two different radio frequency channels. -
FIG. 2 is a block diagram of an exemplary embodiment of a mobile device. -
FIG. 3 is a flowchart illustrative of an example process that may be used to implement the fast downlink frequency switching module ofFIG. 2 . -
FIG. 4 illustrates the receiving relationship of an example first receiver and a second receiver. -
FIG. 5 is a flowchart illustrative of an example process to implement the DLDC reduction signal module ofFIG. 2 . -
FIG. 6 is a flowchart illustrative of an example process to implement the DLDC reduction signal module ofFIG. 2 . - An example mobile station disclosed herein includes hardware and software stored on a tangible computer readable medium that, during operation, cause the mobile station to receive first data from a carrier on a first frequency using a first receiver of the mobile station in a timeslot, tune a second frequency of the carrier using the second receiver while the first receiver is receiving the first data during the timeslot, and receive second data from the carrier on the second frequency using the second receiver during a different timeslot that immediately follows the timeslot.
- In some implementations, the hardware and software further causes the mobile station to receive data on all timeslots within each of two consecutive time division multiple access frames, wherein the frequencies of each of the two time division multiple access frames are different. In some implementations of the mobile station, the hardware and software further cause the mobile station to simultaneously perform a neighbor cell measurement using the second receiver while the first receiver is receiving the first data. In some such implementations, the neighbor cell measurement is performed during the timeslot of the time division multiple access frame.
- In some implementations of the mobile station, the hardware and software further cause the mobile station to transmit an indication to the carrier that the mobile station supports fast downlink frequency switching. In some implementations, the carrier uses frequency hopping. In some implementations, the hardware and software further cause the mobile station to tune a third frequency of the carrier using the first receiver while the second receiver is receiving the second data during the different timeslot.
- Another example mobile station includes hardware and software stored on a tangible computer readable medium that, during operation, cause the mobile station to establish a communication session with a communication network and send mobile station capability information element to the network, wherein the mobile station capability information element includes an element indicating a multislot reduction for dual carrier operation for enhanced flexible timeslot assignment. In some implementations, the element indicating the multislot reduction for dual carrier operation for enhanced flexible timeslot assignment is an enhanced flexible timeslot assignment multislot capability reduction for downlink dual carrier information element. In some implementations, the dual carrier operation is downlink dual carrier operation.
- In some implementations, the mobile station capability information element further includes a second an element indicating a multislot reduction for dual carrier operation for non- enhanced flexible timeslot assignment operation. In some implementations of the mobile station, the hardware and software cause the mobile station to calculate the element indicating the multislot reduction for dual carrier operation for enhanced flexible timeslot assignment.
- In some such implementations, the hardware and software cause the mobile station to calculate the element indicating the multislot reduction for dual carrier operation for enhanced flexible timeslot assignment by determine a maximum number of receive timeslots for a signaled multislot class of the mobile station, determine a maximum number of receive timeslots supported by the mobile station during enhanced flexible timeslot assignment, and determine the multislot reduction for dual carrier operation for enhanced flexible timeslot assignment by subtracting the maximum number of receive timeslots supported by the mobile station during enhanced flexible timeslot assignment from the maximum number of receive timeslots for the signaled multislot class of the mobile station.
- In other implementations, the hardware and software cause the mobile station to calculate the element indicating the multislot reduction for dual carrier operation for enhanced flexible timeslot assignment by determine a maximum number of receive timeslots for an alternative enhanced flexible timeslot assignment multislot class of the mobile station, determine a maximum number of receive timeslots supported by the mobile station during enhanced flexible timeslot assignment, and determine the multislot reduction for dual carrier operation for enhanced flexible timeslot assignment by subtracting the maximum number of receive timeslots supported by the mobile station during enhanced flexible timeslot assignment from the maximum number of receive timeslots for an alternative enhanced flexible timeslot assignment multislot class of the mobile station.
- In other implementations, the hardware and software cause the mobile station to calculate the element indicating the multislot reduction for dual carrier operation for enhanced flexible timeslot assignment by determine a maximum number of receive timeslots for an alternative enhanced flexible timeslot assignment multislot class of the mobile station, determine a maximum number of receive timeslots for a signaled multislot class of the mobile station, determine a maximum number of receive timeslots supported by the mobile station, determine a maximum number of receive timeslots supported by the mobile station during enhanced flexible timeslot assignment, determine a reduction value by subtracting the maximum number of receive timeslots supported by the mobile station from the maximum number of receive timeslots for the signaled multislot class of the mobile station, and determine the multislot reduction for dual carrier operation for enhanced flexible timeslot assignment by subtracting the reduction value and the maximum number of receive timeslots supported by the mobile station during enhanced flexible timeslot assignment from the maximum number of receive timeslots for the alternative enhanced flexible timeslot assignment multislot class of the mobile station.
- In some implementations of the mobile station, the hardware and software further cause the mobile station to omit the element indicating the multislot reduction for dual carrier operation for enhanced flexible timeslot assignment from the mobile station capability information element when the mobile station is capable of receiving fewer than the maximum number of receive timeslots for a signaled multislot class of the mobile station. In some implementations, the hardware and software further cause the mobile station to omit the element indicating the multislot reduction for dual carrier operation for enhanced flexible timeslot assignment from the mobile station capability information element and include a multislot reduction for downlink dual carrier value of reserved for future use when the mobile station is capable of receiving the maximum number of receive timeslots for an alternative enhanced flexible timeslot assignment class for the mobile station.
- Methods and apparatus to implement the implementations of the mobile station are also disclosed.
- Turning to
FIG. 1 , a mobile device 10 (e.g., mobile station (MS)) is shown communicating with awireless base station 12. Themobile device 10 is able to exchange data communications with another entity through one or more ofsuch base stations 12 of a wireless network. The exchange of wireless data is illustrated by the dotted lines. - The
mobile device 10 is capable of utilizingradio receiver equipment radio receiver equipments radio receiver equipments radio receiver equipment radio receiver equipment mobile device 10 to simultaneously receive data at different frequencies, to simultaneously tune to two different frequencies, to perform neighbor cell measurements, and/or any combination of these procedures. For example, for a network supporting downlink dual carrier (DLDC), amobile device 10 that supports DLDC can receive data on two carriers (frequencies) simultaneously. Alternatively, as described in further detail herein, when amobile device 10 that includes the dualradio receiver equipment mobile device 10 may utilize the dualradio receiver equipment base station 12 uses frequency hopping at time division multiple access (TDMA) frames on one or more of the carriers, theradio receiver equipment 14 may be used to receive data and, before the downlink carrier hops frequencies, theradio receiver equipment 16 may tune to the next frequency so that it will be ready to receive data during the next frame reception. The second receiver may additionally perform neighboring cell measurement or base station identity code (BSIC) decoding activity prior to receiving data in the next TDMA frame. Accordingly the switching time defined for the mobile station multislot class can be reduced to zero or almost zero when frequency hopping is used to allow the use of 8 downlink slots per TDMA communication frame. During the next frame, the roles of the dualradio receiver equipment - When the
mobile device 10 is operating in DLDC mode with a network, the amount of data received and, hence, the amount of data that must be processed by themobile device 10 is increased. Accordingly, while the communication system of themobile device 10 may be able to receive communications on a certain number of timeslots per TDMA frame (e.g., 16), the processing system of themobile device 10 may not be able to process the data in a timely manner. Accordingly, as explained in further detail below, themobile device 10 may signal the network that a reduced number of slots should be used when operating in DLDC mode. - In the illustrated example, at least one of the
radio receiver equipments mobile device 10 can transmit data. In other embodiments, each of theradio receiver equipments mobile device 10 may be able to transmit, as well as receive simultaneously at different frequencies. - The
mobile device 10 can be a two-way communication device with advanced data communication capabilities including the capability to communicate with othermobile devices 10 or computer systems through a network of transceiver stations. Themobile device 10 may also have the capability to allow voice communication. Depending on the functionality provided by themobile device 10, it may be referred to as a data messaging device, a two-way pager, a cellular telephone with data messaging capabilities, a wireless Internet appliance, or a data communication device (with or without telephony capabilities). Themobile device 10 can also be one that is used in a system that is configured for continuously routing all forms of pushed information from a host system to themobile device 10. - An exemplary configuration for the
mobile device 10 is illustrated inFIG. 2 . Referring first toFIG. 2 , shown therein is a block diagram of an exemplary embodiment of amobile device 10. Themobile device 10 comprises a number of components such as amain processor 102 that controls the overall operation of themobile device 10. Communication functions, including data and voice communications, are performed through acommunication subsystem 104. Thecommunication subsystem 104 receives data from and sends data to awireless network 20. In this exemplary embodiment of themobile device 10, thecommunication subsystem 104 is configured in accordance with the GSM and GPRS standards, which are used worldwide. Other communication configurations that are equally applicable are, for example, Evolved EDGE or EDGE Evolution, as discussed above. New standards are still being defined, but it is believed that they will have similarities to the network behavior described herein, and it will also be understood by persons skilled in the art that the embodiments described herein are intended to use any other suitable standards that are developed in the future. The wireless link connecting thecommunication subsystem 104 with thewireless network 20 represents one or more different Radio Frequency (RF) channels, operating according to defined protocols specified for GSM/GPRS communications. - The
main processor 102 also interacts with additional subsystems such as a Random Access Memory (RAM) 106, aflash memory 108, adisplay 110, an auxiliary input/output (I/O)subsystem 112, a data port 114, akeyboard 116, aspeaker 118, amicrophone 120, aGPS receiver 121, short-range communications 122, andother device subsystems 124. As will be discussed below, the short-range communications 122 can implement any suitable or desirable device-to-device or peer-to-peer communications protocol capable of communicating at a relatively short range, e.g. directly from one device to another. Examples include Bluetooth®, ad-hoc WiFi, infrared, or any “long-range” protocol re-configured to utilize available short-range components. It will therefore be appreciated that short-range communications 122 may represent any hardware, software or combination of both that enable a communication protocol to be implemented between devices or entities in a short range scenario, such protocol being standard or proprietary. - Some of the subsystems of the
mobile device 10 perform communication-related functions, whereas other subsystems may provide “resident” or on-device functions. By way of example, thedisplay 110 and thekeyboard 116 may be used for both communication-related functions, such as entering a text message for transmission over thenetwork 20, and device-resident functions such as a calculator or task list. - The
mobile device 10 can send and receive communication signals over thewireless network 20 after required network registration or activation procedures have been completed. Network access is associated with a subscriber or user of themobile device 10. To identify a subscriber, themobile device 10 may use a subscriber module component or “smart card” 126, such as a Subscriber Identity Module (SIM), a Removable User Identity Module (RUIM) and a Universal Subscriber Identity Module (USIM). In the example shown, a SIM/RUIM/USIM 126 is to be inserted into a SIM/RUIM/USIM interface 128 in order to communicate with a network. Without thecomponent 126, themobile device 10 is not fully operational for communication with thewireless network 20. Once the SIM/RUIM/USIM 126 is inserted into the SIM/RUIM/USIM interface 128, it is coupled to themain processor 102. - The
mobile device 10 is typically a battery-powered device and in this example includes a battery interface 132 for receiving one or morerechargeable batteries 130. In at least some embodiments, thebattery 130 can be a smart battery with an embedded microprocessor. The battery interface 132 is coupled to a regulator (not shown), which assists thebattery 130 in providing power V+ to themobile device 10. Although current technology makes use of a battery, future technologies such as micro fuel cells may provide the power to themobile device 10. - The
mobile device 10 also includes an operating system 134 andsoftware components 136 to 146 which are described in more detail below. The operating system 134 and thesoftware components 136 to 146 that are executed by themain processor 102 are typically stored in a persistent store such as theflash memory 108, which may alternatively be a read-only memory (ROM) or similar storage element (not shown). Those skilled in the art will appreciate that portions of the operating system 134 and thesoftware components 136 to 146, such as specific device applications, or parts thereof, may be temporarily loaded into a volatile store such as theRAM 106. Other software components can also be included, as is well known to those skilled in the art. - The subset of
software applications 136 that control basic device operations, including data and voice communication applications, may be installed on themobile device 10 during its manufacture. Software applications may include amessage application 138, adevice state module 140, a Personal Information Manager (PIM) 142, aconnect module 144 and an IT policy module 146, a fast downlinkfrequency switching module 148, and a DLDCreduction signal module 150. Amessage application 138 can be any suitable software program that allows a user of themobile device 10 to send and receive electronic messages, wherein messages are typically stored in theflash memory 108 of themobile device 10. Adevice state module 140 provides persistence, i.e. thedevice state module 140 ensures that important device data is stored in persistent memory, such as theflash memory 108, so that the data is not lost when themobile device 10 is turned off or loses power. APIM 142 includes functionality for organizing and managing data items of interest to the user, such as, but not limited to, e-mail, text messages, instant messages, contacts, calendar events, and voice mails, and may interact with thewireless network 20. Aconnect module 144 implements the communication protocols that are required for themobile device 10 to communicate with the wireless infrastructure and any host system 25, such as an enterprise system, that themobile device 10 is authorized to interface with. An IT policy module 146 receives IT policy data that encodes the IT policy, and may be responsible for organizing and securing rules such as the “Set Maximum Password Attempts” IT policy. - The fast downlink
frequency switching module 148 of the illustrated example controls the operation of thecommunication subsystem 104 to enable themobile device 100 to use multiple receivers (e.g., dualradio receiver equipment FIG. 1 ) with a single carrier using frequency hopping to reduce switching time. In particular, when two receivers are present (e.g., in a DLDC capable mobile device), the example fast downlinkfrequency switching module 148 causes a second receiver to perform a neighborhood cell measurement and tune to an upcoming frequency while the first receiver is receiving data on a current frequency when, for example, a neighborhood cell measurement is not needed. Alternatively, the fast downlinkfrequency switching module 148 may cause the second receiver to tune to the upcoming frequency without performing a neighborhood cell measurement. Accordingly, when the network hops to the upcoming frequency, themobile device 100 can immediately receive data using the second receiver without waiting for the first receiver to tune to the new frequency. Subsequently, the first receiver can prepare for the next hop and the cycle continues. An example process to implement the fast downlinkfrequency switching module 148 is described in conjunction with the flowchart ofFIG. 3 . - The DLDC
reduction signal module 150 of the illustrated example signals the network with a reduction of timeslots value for themobile device 100. The reduction of timeslots value is used to signal the reduced capabilities of themobile device 100 due to the reception of additional timeslots during DLDC mode operation (i.e., receiving the maximum number of timeslots (e.g., twice as many time slots) using each of the receivers). The reduction of timeslots value is a number by which the maximum number of timeslots for the associated multislot class must be reduced to determine the timeslot capability of themobile device 100. For example, when the multislot class assigned to themobile device 100 indicates that the mobile device can support up to 8 timeslots per frame per receiver and the mobile device uses two receivers to have a theoretical maximum of 16 timeslots per frame, the DLDCreduction signal module 150 may determine that the reduction of timeslots value is 4 because themobile device 100 is only capable of processing 12 (16−4=12) timeslots per frame (e.g., due to decoding or processing overhead). The DLDCreduction signal module 150 of the illustrated example sends a first reduction of timeslots value for the non-EFTA operation mode of the mobile device and a second reduction of timeslots value for the EFTA operation mode of the mobile device to provide the network with an indication of the capabilities of themobile device 100 in each operation mode because the capabilities of themobile device 100 may be different in each mode. An example process to implement the DLDCreduction signal module 150 is described in conjunction with the flowchart ofFIG. 5 . - Other types of software applications or
components 139 can also be installed on themobile device 10. Thesesoftware applications 139 can be pre-installed applications (i.e. other than message application 138) or third party applications, which are added after the manufacture of themobile device 10. Examples of third party applications include games, calculators, utilities, etc. Theadditional applications 139 can be loaded onto themobile device 10 through at least one of thewireless network 20, the auxiliary I/O subsystem 112, the data port 114, the short-range communications subsystem 122, or any othersuitable device subsystem 124. - The data port 114 can be any suitable port that enables data communication between the
mobile device 10 and another computing device. The data port 114 can be a serial or a parallel port. In some instances, the data port 114 can be a USB port that includes data lines for data transfer and a supply line that can provide a charging current to charge thebattery 130 of themobile device 10. - For voice communications, received signals are output to the
speaker 118, and signals for transmission are generated by themicrophone 120. Although voice or audio signal output is accomplished primarily through thespeaker 118, thedisplay 110 can also be used to provide additional information such as the identity of a calling party, duration of a voice call, or other voice call related information. - For composing data items, such as e-mail messages, for example, a user or subscriber could use a the touch-
sensitive overlay 34 on thedisplay 32 that are part of thetouch screen display 28, in addition to possibly the auxiliary I/O subsystem 112. The auxiliary I/O subsystem 112 may include devices such as: a mouse, track ball, infrared fingerprint detector, or a roller wheel with dynamic button pressing capability. - Flowcharts representative of example processes that may be carried out by the
mobile station 100 are shown inFIGS. 3 and 5 . In these examples, the process represented by each flowchart may be implemented by one or more programs comprising machine readable instructions for execution by: (a) a processor, such as themain processor 102 shown in the examplemobile device 100 ofFIG. 2 , (b) a controller, and/or (c) any other suitable device, such as a digital signal processor (DSP). The one or more programs may be embodied in software stored on a tangible medium such as, for example, a flash memory, a CD-ROM, a floppy disk, a hard drive, a DVD, or a memory associated with themain processor 102, but the entire program or programs and/or portions thereof could alternatively be executed by a device other than themain processor 102 and/or embodied in firmware or dedicated hardware (e.g., implemented by an application specific integrated circuit (ASIC), a programmable logic device (PLD), a field programmable logic device (FPLD), discrete logic, etc.). - For example, any or all of the fast downlink
frequency switching module 148 and the DLDCreduction signal module 150, or, for that matter, any of the functions shown inFIG. 1 , could be implemented by any combination of software, hardware, and/or firmware. Also, some or all of the processes represented by the flowcharts ofFIGS. 3 and 5 may be implemented manually. Further, although the example processes are described with reference to the flowcharts illustrated inFIGS. 3 and 5 , many other techniques for implementing the example methods and apparatus described herein may alternatively be used. For example, with reference to the flowcharts illustrated inFIGS. 3 and 5 , the order of execution of the blocks may be changed, and/or some of the blocks described may be changed, eliminated, combined and/or subdivided into multiple blocks. -
FIG. 3 is a flowchart illustrative of an example process that may be used to implement the fast downlinkfrequency switching module 148 ofFIG. 2 . The example flowchart ofFIG. 3 begins when a first receiver ofcommunication subsystem 104 of themobile device 100 receives data on a first tuned frequency from the network (block 302). According to the illustrated example, themobile device 100 supports DLDC, but the network is operating in single carrier frequency hopping mode and, thus, the dual receiver capability of themobile device 100 can be utilized with the single carrier mode. While the first receiver of themobile device 100 is receiving data, the fast downlinkfrequency switching module 148 causes the second receiver to perform a neighbor cell measurement (block 304). For example, the second receiver may perform the neighbor cell measurement shortly before a frequency hop is to occur with enough time for the second receiver to complete the neighbor cell measurement and to tune to the next frequency. - After the neighbor cell measurement is complete (block 304), the fast downlink
frequency switching module 148 causes the second receiver to tune to the next frequency to which the network will hop (block 306). For example, the frequency hopping scheme of the network may be known to themobile device 100 by one or more of a lookup table, a predefined equation for determining the next frequency, a communication of the frequencies from the network, etc. Once the second receiver is tuned (block 306) and the network hops to the next frequency, the second receiver begins receiving data on the tuned frequency (block 308). Accordingly, there is little or no requirement for tuning delay to be accommodated between reception of data on either side of frequency hops. Thus, even when frequency hopping is used in the network, themobile device 100 can support a maximum number of receiving timeslots in each TDMA frame (e.g., 8 timeslots per TDMA frame). - While the second receiver is receiving data (block 308), the fast downlink
frequency switching module 148 causes the first receiver to perform a neighbor cell measurement (block 310) and tune to the next frequency (block 312) to prepare for a frequency hop. Accordingly, themobile device 100 cycles between the first receiver and the second receiver alternately. - While the flowchart of
FIG. 3 is illustrative of a process that is performed sequentially, the process illustrated byFIG. 3 may be performed in parallel. For example, at the same time that the first receiver is receiving data on the tuned frequency (block 302) the second receiver may be performing one or more of tuning to a neighbor cell measurement frequency, conducting a neighbor cell measurement (block 304), and/or tuning to the next frequency (block 306). Likewise, while the second receiver is receiving data on the next frequency (block 308), the first receiver may be performing one or more of tuning to a neighbor cell measurement frequency, conducting a neighbor cell measurement (block 310), and/or tuning to the next frequency (block 312). Alternatively, any other arrangement and timing of the blocks may be used. For example, some of the blocks may be performed in series and some of the blocks may be performed in parallel. - Additional blocks may be included in the process illustrated in
FIG. 3 . For example, the fast downlinkfrequency switching module 148 may additionally signal to network that themobile device 100 supports fast downlink frequency switching. For example, the fast downlinkfrequency switching module 148 may transmit an MS Radio Access Capability information element to the network that includes a fast downlink frequency switching capability bit as illustrated below for 3GPP TS 24.008. -
< Fast Downlink Frequency Switching Capability : bit >; . . . Fast Downlink Frequency Switching Capability (1 bit field) This field indicates whether the mobile station supports fast downlink frequency switching between two consecutive TDMA frames. 0 Fast downlink frequency switching not supported 1 Fast downlink frequency switching supported - Alternatively, the fast downlink frequency switching mobile 148 could signal the capability of receiving a maximum number of timeslots in other ways. For example, the fast downlink
frequency switching module 148 could specify that Alternative EFTA classes apply to single carrier operation, but do not apply to DLDC, the fast downlinkfrequency switching module 148 could indicate that a maximum number of timeslots may be used and also indicate a DLDC reduction for EFTA to cause the maximum number of timeslots to be used in single carrier but a number of timeslots reduced by the DLDC reduction for EFTA in dual carrier operation, or Alternative EFTA classes could be defined so that a maximum number of receive timeslots map to a reduced number of receive timeslots per carrier in DLDC configuration. The described approaches could apply in all DLDC situations or could only apply when frequency hopping is used on at least one carrier or on the respective carrier. For example, if one carrier uses frequency hopping, but the other does not, themobile device 100 may be able to support a maximum number of timeslots (e.g., 8 receive timeslots) on the non-hopping carrier and fewer timeslots (e.g., 7 receive timeslots) on the hopping carrier. -
FIG. 4 illustrates the receiving relationship of an examplefirst receiver 402 and a second receiver 404 (e.g., receivers of thecommunication subsystem 104 of the mobile device 100). According to the illustrated example, thefirst receiver 402 is receiving data during afirst time period 406. During asecond time period 408 that is at least partially overlapping with thefirst time period 406, thesecond receiver 404 performs a neighbor cell measurement and tunes to a next frequency to which the network with hop. Thefirst time period 406 ends when the network hops to a new frequency. When the network hops to a new frequency, the second receiver begins receiving data duringtime period 410. As shown in the illustrated example, because the second receiver performs neighbor cell measurement and tuning duringtime period 406, whentime period 406 ends, thesecond receiver 410 can immediately or nearly immediately begin receiving data. - By way of example, Table 1 shows that some implementations of the system and method described herein can enable the parameter reflecting the time needed for the mobile device 100 (e.g., capable of receiving up to 8 timeslots within a single TDMA frame on a single radio frequency channel) to perform adjacent cell signal level measurements and get ready to receive data to be set to zero even when the network uses frequency hopping. Table 1 is adapted from 3GPP TS 45.002. In the table, Rx describes the maximum number of receive timeslots that the MS can use per TDMA frame, Tx describes the maximum number of transmit timeslots that the MS can use per TDMA frame, Sum is the total number of uplink (u) and downlink (d) TS that can actually be used by the MS per TDMA frame (in a single carrier configuration), Tta relates to the time needed for the MS to perform adjacent cell signal level measurement and get ready to transmit, Ttb relates to the time needed for the MS to get ready to transmit data, Tra relates to the time needed for the MS to perform adjacent cell signal level measurement and get ready to receive, and Trb relates to the time needed for the MS to get ready to receive data. Similar implementations may apply for other multislot class mobile stations capable of receiving less than 8 timeslots.
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TABLE 1 Classes for Multislot Capability Maximum number Multislot of slots Minimum number of slots class Rx Tx Sum Tta Ttb Tra Trb Type 1 1 1 2 3 2 4 2 1 2 2 1 3 3 2 3 1 1 3 2 2 3 3 2 3 1 1 4 3 1 4 3 1 3 1 1 5 2 2 4 3 1 3 1 1 6 3 2 4 3 1 3 1 1 7 3 3 4 3 1 3 1 1 8 4 1 5 3 1 2 1 1 9 3 2 5 3 1 2 1 1 10 4 2 5 3 1 2 1 1 11 4 3 5 3 1 2 1 1 12 4 4 5 2 1 2 1 1 13 3 3 NA NA a) 3 a) 2 14 4 4 NA NA a) 3 a) 2 15 5 5 NA NA a) 3 a) 2 16 6 6 NA NA a) 2 a) 2 17 7 7 NA NA a) 1 0 2 18 8 8 NA NA 0 0 0 2 19 6 2 NA 3 b) 2 c1) 1 20 6 3 NA 3 b) 2 c1) 1 21 6 4 NA 3 b) 2 c1) 1 22 6 4 NA 2 b) 2 c1) 1 23 6 6 NA 2 b) 2 c1) 1 24 8 2 NA 3 b) 2 c2) 1 25 8 3 NA 3 b) 2 c2) 1 26 8 4 NA 3 b) 2 c2) 1 27 8 4 NA 2 b) 2 c2) 1 28 8 6 NA 2 b) 2 c2) 1 29 8 8 NA 2 b) 2 c2) 1 30 5 1 6 2 1 1 1 1 31 5 2 6 2 1 1 1 1 32 5 3 6 2 1 1 1 1 33 5 4 6 2 1 1 1 1 34 5 5 6 2 1 1 1 1 35 5 1 6 2 1 1+to 1 1 36 5 2 6 2 1 1+to 1 1 37 5 3 6 2 1 1+to 1 1 38 5 4 6 2 1 1+to 1 1 39 5 5 6 2 1 1+to 1 1 40 6 1 7 1 1 1 to 1 41 6 2 7 1 1 1 to 1 42 6 3 7 1 1 1 to 1 43 6 4 7 1 1 1 to 1 44 6 5 7 1 1 1 to 1 45 6 6 7 1 1 1 to 1 a) = 1 with frequency hopping. = 0 without frequency hopping. b) = 1 with frequency hopping or change from Rx to Tx. = 0 without frequency hopping and no change from Rx to Tx. c1) = 1 with frequency hopping or change from Tx to Rx. = 0 without frequency hopping and no change from Tx to Rx. c2) Same values as for c1) apply except that, for the frequency hopping case, Trb = 0 for a Downlink Dual Carrier capable MS indicating the corresponding multislot class as its alternative EFTA multislot class (see sub-clause B.5) and assigned a single carrier configuration. - In the example of Table 1, according to the system and method disclosed herein, the parameter reflecting the time needed for the
mobile device 100 to perform adjacent cell signal level measurement or the BSIC decoding and get ready to receive data (Tra) may be zero for multislot classes 24-29 when such measurements or BSIC decoding and preparation are performed by a second receive during a receive timeslot for a first receiver. According to current standards, Measurements or BSIC decoding are not expected of mobile devices which are assigned 7 or 8 downlink timeslots (regardless of whether or not frequency hopping is applied) in accordance with Table 2 (seenotes 1 and 2): -
TABLE 2 Multislot configurations for packet switched connections in A/Gb mode 3GPP TS 45.002 Applicable Medium Tra Tta Multislot access No of Slots shall shall classes (see mode (Note 0) apply apply Note 7) Note Downlink, d = 1-6 Yes — 1-12, 19-45 any d = 7-8 No — 24-29 1, 2 mode Uplink, u = 1-2 Yes — 1-12, 19-45 10 Dynamic u = 2 — Yes 12, 36-39 11 u = 3 Yes 12, 37-39 9 u = 2-3 Yes — 31-34, 41-45 9 Uplink, u = 1-3 Yes — 1-12, 19-45 Ext. u = 4 — Yes 12, 22-23, 2 Dynamic 27-29 u = 4 Yes — 33-34, 38-39, 2 43-45 u = 5 Yes — 34, 39 2, 3, 5 u = 5 — Yes 44-45 2, 4 u = 6 — Yes 45 2, 4, 5 Down + d + u = 2-5, u < 3 Yes — 1-12, 19-45 10 up, d + u = 6, u < 3 Yes — 30-45 2, 3 Dynamic d + u = 7, u < 3 — Yes 40-45 2, 4 d = 2, u = 3 Yes — 32-34, 42-45 9 d + u = 5, u = 2-3 — Yes 12, 36-39 9 d + u = 6, u = 3-4 Yes — 32-34, 37-39, 2, 3, 9 42-45 d + u = 7, u = 3-4 — Yes 42-45 2, 4, 9 d = 4, u = 4 Yes — 33-34, 38-39, 2, 3, 8, 9 43-45 d = 4, u = 5 — Yes 44-45 2, 4, 8, 9 d + u = 8-10, Yes — 30-45 12 u < 3 Down + d + u = 2-4 Yes — 1-12, 19-45 up, d + u = 5, d > 1 Yes — 8-12, 19-45 Ext. d + u = 6-7, u < 4 Yes — 10-12 8 Dynamic d = 1, u = 4 — Yes 12, 22-23, 2 27-29 d > 1, u = 4 — Yes 12 2, 8 d = 1, u = 4 Yes — 33-34, 38-39, 2, 6 43-45 d + u = 6, d > 1 Yes — 30-45 2, 3 d = 1, u = 5 Yes — 34, 39 2, 3, 5 d + u = 7-9, u < 5 Yes — 31-34, 36-39 2, 3, 8 d > 1, u = 5 Yes — 34, 39 2, 3, 5, 8 d = 1, u = 5 — Yes 44-45 2, 4 d + u = 7, d > 1 — Yes 40-45 2, 4 d = 1, u = 6 — Yes 45 2, 4, 5 d + u = 8-11, — Yes 41-45 2, 4, 8 u < 6 d > 1, u = 6 — Yes 45 2, 4, 5, 8 d + u = 12-16 Yes — 30-39 12 u > 2 d + u = 12-16 — Yes 40-45 12 u > 2 Note 0 If the downlink timeslots assigned (allocated) to the mobile station are not contiguous, d shall also include the number of downlink timeslots not assigned (allocated) to the mobile station that are located between assigned (allocated) downlink timeslots. Similarly, if the uplink timeslots assigned (allocated) to the mobile station are not contiguous, u shall also include the number of uplink timeslots not assigned (allocated) to the mobile station that are located between assigned (allocated) uplink timeslots. Note 1 Normal measurements are not possible (see 3GPP TS 45.008) except, for example, in the case of a downlink dual carrier capable MS operating in signal carrier mode using its second receiver for measurements regardless of the applicability of Tra or Trb. Note 2 Normal BSIC decoding is not possible (see 3GPP TS 45.008) except e.g. in case of a downlink dual carrier capable MS operating in single carrier mode using its second receiver for BSIC decoding regardless of the applicability of Tra or Trb. Note 3 TA offset required for multislot classes 35-39. Note 4 TA offset required for multislot classes 40-45. Note 5 Shifted USF operation shall apply (see 3GPP TS 44.060). Note 6 The network may fallback to a lower multislot class and may not apply Tra. A multislot class 38 or 39 MS shall in this case use Tta for timing advance values below 31. Note 7 For dual carrier operation the Applicable Multislot class is the Signalled multislot class or the Equivalent multislot class (if different from the Signalled multislot class) as defined in Table B.2. For EFTA operation the Applicable Multislot class is the Signalled multislot class. Note 8 These configurations can only be used for assignment to an MS supporting Flexible Timeslot Assignment (see 3GPP TS 24.008). For allocation additional restrictions apply. Note 9 These configurations can be used only in RTTI configuration. Note 10 These configurations can be used in RTTI configurations only when the timeslots of the corresponding downlink PDCH-pair are contiguous. Note 11 These configurations can be used only in RTTI configurations when the timeslots of the corresponding downlink PDCH-pair are not contiguous. Note 12 These configurations can only be used for assignment to an MS for which Enhanced Flexible Timeslot Assignment is used (see 3GPP TS 44.060). Whether normal measurements (see 3GPP TS 45.008) and/or normal BSIC decoding (see 3GPP TS 45.008) are possible will be dependent of allocation. - Trb reflects the effective switching time when no measurement is performed, while Tra reflects the time needed for the MS to perform adjacent cell signal level measurement and get ready to receive. According to current standards, the mobile station is not expected to perform adjacent cell signal level measurement when assigned or allocated some multislot configuration by the network (e.g., those where Trb is applicable instead Tra). Also BSIC decoding may not be possible for some other multislot configurations. However, as described above, in accordance with the system and method disclosed herein, neighbor cell measurements and/or BSIC decoding and/or tuning are performed on a second receiver in parallel with receiving data on the first receiver. Accordingly, regardless of the applicability or the value of the Tra parameter for the relevant multislot configurations, neighbor cell measurements and/or BSIC decoding and/or neighbor cell measurement tuning may be performed on a second receiver in parallel with receiving data on a first receiver in accordance with
note 1 and note 2 of Table 2, while a maximum number of receive timeslots may be available (e.g., 8 receive timeslots per TDMA frame). -
FIG. 5 is a flowchart illustrative of an example process to implement the DLDCreduction signal module 150 ofFIG. 2 . The example flowchart ofFIG. 5 begins when themobile device 100 establishes a connection a communication network (block 502). For example, themobile device 100 may send a mobility management ATTACH request to the network and response an ACCEPT response. Alternatively, any of several processes may be performed by themobile device 100 until, at some time, themobile device 100 undertakes to communicate the capabilities of themobile device 100 to the network. The DLDCreduction signal module 150 then causes themobile device 100 to determine the maximum number of receive timeslots for the signaled multislot class (referenced as X herein) (block 504). For example, Table 3 shows that when a mobile device declares signaled multislot class 33, the maximum number of downlink timeslots is 10. The DLDCreduction signal module 150 then determines the maximum number of receive timeslots supported by the device (referenced as Y) (block 506). For example, the DLDCreduction signal module 150 may determine that, despite the maximum number of downlink timeslots being 10 for the signaled multislot class 33, the processing capabilities of themobile device 100 limit the device to processing 8 receive timeslots. - The DLDC
reduction signal module 150 then determines if an alternative EFTA multislot class has been or is to be signaled (Block 508). When an alternative EFTA multislot class has been or is to be signaled, the DLDCreduction signal module 150 determines a maximum number of receive timeslots for the alternative multislot class for EFTA (referenced as A) (block 510). Alternatively, when an alternative EFTA multislot class has not been signaled, the DLDCreduction signal module 150 determines the maximum number of receive timeslots for the signaled multislot class (or uses the value determined in block 504) (referenced as A) (block 512). The DLDCreduction signal module 150 then determines the maximum number of receive timeslots supported by themobile device 100 during EFTA operation (referenced as B) (block 514). In another implementation, block 514 may follow directly fromblock 510 and not 512 and control may then proceed to block 516. In such an implementation, block 518 may not be performed when an alternative EFTA multislot class is not signaled and control may proceed, instead, to block 516. - The DLDC
reduction signal module 150 then calculates a non-EFTA reduction value by subtracting Y from X (block 516). In other words, the DLDCreduction signal module 150 subtracts the maximum number of receive timeslots supported by the device from the maximum number of receive timeslots for the signaled multislot class to determine the non-EFTA reduction value. - The DLDC
reduction signal module 150 then determines the EFTA reduction value based on the values determined in one or more of blocks 504-514. For example, the DLDCreduction signal module 150 may determine the EFTA reduction value by subtracting B from A (block 518A). In other words, the DLDCreduction signal module 150 may subtract the maximum number of receive timeslots for the device during EFTA operation from the maximum timeslots for the alternative EFTA multislot class to determine the EFTA reduction value. Alternatively, the DLDCreduction signal module 150 may determine the EFTA reduction value by calculating A−(X−Y)−B. In other words, the DLDC reduction signal module may subtract the non-EFTA reduction value and the maximum number of receive timeslots for the device during EFTA operation from the maximum number of receive timeslots for the alternative EFTA multislot class to determine the EFTA reduction value. - After computing the non-EFTA reduction value (block 516) and the EFTA reduction value (block 518), the DLDC
reduction signal module 150 causes themobile device 100 to send MS radio access capability information including the non-EFTA reduction value and the EFTA reduction value to the network (block 520). Alternatively, any other type of information element or message could be used. Accordingly, a network element can utilize the non-EFTA reduction value and the EFTA reduction value to determine the capabilities of themobile device 100 by subtracting the reduction values from the maximum values for the signaled class as defined, for example, in 3GPP TS 45.002. -
TABLE 3 Multislot Class Values from 3GPP TS 45.002 Equivalent multislot class when “Multislot Capability Reduction for Downlink Dual Alternative Maximum Carrier” IE indicates Signaled EFTA Number of reduction of: multislot multislot downlink 0 or 1 2 or more class class timeslots timeslots timeslots Note 8 — 10 30 8 — 10 — 10 31 10 — 11 — 10 32 11 — 12 — 10 33 12 — 30 — 10 — — — 31 — 10 — — — 32 — 10 — — — 33 — 10 — — — 34 — 10 — — — 35 — 10 — — — 36 — 10 — — — 37 — 10 — — — 38 — 10 — — — 39 — 10 — — — 40 — 12 — — — 41 — 12 — — — 42 — 12 — — — 43 — 12 — — — 44 — 12 — — — 45 — 12 — — — 30-39 None 10 — — 0 40-45 None 12 — — 0 30-45 19-23 12 — — 0 30-45 24-29 16 — — 0 - For example, an example information element to transmit the EFTA reduction value to the network is shown below based on 3GPP TS 24.008. This information element is provided as an example and other implementations may be used.
-
< Enhanced Flexible Timeslot Assignment Struct > ::= { 0 | 1 < Alternative EFTA Multislot Class : bit(4) > { 0 | 1 < Additional EFTA Multislot Capability Reduction for Downlink Dual Carrier : bit (2) > } }; . . . Additional EFTA Multislot Capability Reduction for Downlink Dual Carrier (2 bit field) This field indicates an additional receive multislot capability reduction of a dual carrier capable mobile station applicable to EGPRS and EGPRS2 support (see 3GPP TS 45.002 [32]) for EFTA when an alternative EFTA multislot class is Signaled. The value of this field is additive to the value indicated by the Multislot Capability Reduction for Downlink Dual Carrier field. The field is coded as follows: Bit 2 1 0 0 The MS supports 1 less receive timeslot than the value indicated by Multislot Capability Reduction for Downlink Dual Carrier 0 1 The MS supports 2 less receive timeslots 1 0 The MS supports 3 less receive timeslots 1 1 The MS supports 4 less receive timeslots If this field is not included, the value indicated by the Multislot Capability Reduction for Downlink Dual Carrier field applies for the alternative EFTA multislot class. - The DLDC
reduction signal module 150 may alternatively signal the network of the reduced receive capability for EFTA using a combination of a non-EFTA reduction value and an EFTA reduction value. An example implementation is illustrated in Table 4. The values in Table 4 are agreed upon by a supporting network and themobile device 100. The values in Table 4 are chosen such that a network that does not support the updated configuration will not unnecessarily reduce the operation in EFTA (e.g., the legacy non-EFTA reduction value (multislot capability reduction for downlink dual carrier) is zero). However, the values in Table 4 are provided as an example and other implementations are possible. - As shown in Table 4, when the mobile device omits the EFTA reduction value (e.g., additional multislot capability reduction for downlink dual carrier for EFTA), the network will recognize the reduction value as the maximum number of receive timeslots for the signaled multislot class for the
mobile device 100 minus the non-EFTA reduction value (e.g., multislot capability reduction for downlink dual carrier) (e.g., N-2). Alternatively, when themobile device 100 can support more receive timeslots than the maximum number of receive timeslots for the signaled multislot class, the DLDCreduction signal module 148 will cause themobile device 100 to send the non-EFTA reduction value as zero and set the EFTA reduction value appropriately. Based on the received values, the network will recognize the reduction value as the maximum number of receive timeslots applicable to the Alternative EFTA multislot class minus the EFTA reduction value. -
TABLE 4 Reduction Values based on non-EFTA reduction value and EFTA reduction value “Additional Multislot Capability “Multislot Reduction Reduced receive capability for EFTA Capability for assignments (i.e. the maximum number Reduction for Downlink of receive timeslots per TDMA frame in Downlink Dual Dual Carrier dual carrier) Carrier” for EFTA” . . . . . . . . . N − 2 2 Omitted N − 1 1 Omitted N = maximum number of receive 0 Omitted timeslots for signalled multislot class (e.g. 10 for class 33) N + 1 0 M − N − 1 . . . 0 . . . M − 2 0 2 M − 1 0 1 M = maximum number of receive 0 0 timeslots for Alternative EFTA Multislot class (e.g. 16 for class 24) N = The maximum number of receive timeslots applicable to the signaled multislot class M = The maximum number of receive timeslots applicable to the Alternative EFTA multislot class -
FIG. 6 is a flowchart representative of an example process to implement the DLDCreduction signal module 150 in accordance with the approach illustrated Table 4. When the DLDCreduction signal module 150 determines that it is time to signal the network of the receive timeslot capabilities of themobile device 100, the flowchart ofFIG. 6 begins with the DLDCreduction signal module 150 determining if themobile device 100 supports more than the maximum number of receive timeslots for the signaled multislot class (block 602). For example, the signaled multislot class may indicate that 10 receive timeslots are supported, but the mobile device operating in DLDC may support, for example, 16 receive timeslots according to the maximum number of receive timeslots for alternative EFTA multislot class. - When the mobile device supports more receive timeslots than the maximum number of receive timeslots for the signaled multislot class (block 602), the DLDC
reduction signal module 150 sets a non-EFTA reduction value (e.g., multislot capability reduction for downlink dual carrier) to zero (block 604). The DLDCreduction signal module 150 further sets an EFTA reduction value (e.g., additional multislot capability reduction for downlink dual carrier for EFTA) to a necessary reduction value (block 606). For example, if the maximum number of receive timeslots for alternative EFTA multislot class for themobile device 100 is 16 and themobile device 100 can only support 12 receive timeslots, the DLDCreduction signal module 150 will set the EFTA reduction value to 4. Control then proceeds to block 612, which is described below. According to the illustrated example, a legacy network element that does not support the additional EFTA reduction value, will receive the non-EFTA reduction value of zero and, thus, will determine that themobile device 100 can support the maximum number of timeslots for the signaled multislot class. - When the mobile device does not support more receive timeslots than the maximum number of receive timeslots for the signaled multislot class (block 602), the DLDC
reduction signal module 150 sets the non-EFTA reduction value to the necessary reduction (block 608). For example, if the mobile device can support up to 7 timeslots and the maximum number of receive timeslots for the signaled multislot class is 10, the DLDCreduction signal module 150 sets the non-EFTA reduction value to 3. The DLDCreduction signal module 150 also causes the EFTA reduction value to be omitted from the subsequent information element (block 610). For example, the DLDCreduction signal module 150 may cause the EFTA reduction value to be omitted by not causing the value to be added to the information element. By omitting the EFTA reduction value, the amount of data needed to be transmitted to the network can be reduced. Alternatively, any other method of signaling the network that the non-EFTA reduction should be used may be implemented. Control then proceeds to block 612. - After the DLDC
reduction signal module 150 determines the appropriate non-EFTA reduction value and/or EFTA reduction value (blocks 604-606 and 608-610), the DLDCreduction signal module 150 causes the capability information element (e.g., a MS Radio Access Capability Information Element) including one or both of the non-EFTA reduction value and the EFTA reduction value to be transmitted to the network (block 612). While the illustrated example only describes the inclusion of the non-EFTA reduction value and the EFTA reduction value in the capability information element, any data may be included such as, for example, the data described in 3GPP TS 24.008. - Table 5 substrates an alternative to the approach described in conjunction with Table 4. The values in Table 5 are the same as Table 4, except for the case where the
mobile device 100 supports the maximum number of receive timeslots for alternative EFTA multislot class. In this case, the DLDCreduction signal module 150 may set the non-EFTA reduction value to a value that is intended to be “reserved for future use” and omit the EFTA reduction value. Accordingly, a network element that supports the enhanced indicators will recognize such values as an indication that themobile device 100 supports the maximum number of receive timeslots for alternative EFTA multislot class. Alternatively, a network element that does not support the enhanced indicators (e.g., a legacy network) will understand the “reserved for future use” value to be zero and will not reduce the number of receive timeslots below the maximum number of timeslots for the multislot class. The “reserved for future use” value may be any value that can be recognized by the network and understood to be zero by a legacy network. For example, the “reserved for future use” value could be the bit combination 111. Accordingly, signaling efficiency is achieved by not requiring the EFTA reduction value to be transmitted when maximum number of receive timeslots are supported. While the “reserved for future use” value is shown as being used in one particular instance, “reserved for future use” may be used in other instances. -
TABLE 5 Reduction Values based on non-EFTA reduction value and EFTA reduction value “Additional Multislot Multislot Capability Reduced receive capability for EFTA Capability Reduction assignments (i.e. the maximum number Reduction for for Downlink of receive timeslots per TDMA frame Downlink Dual Dual Carrier in dual carrier) Carrier” for EFTA” . . . . . . . . . N − 2 2 Omitted N − 1 1 Omitted N = maximum number of receive 0 Omitted timeslots for signaled multislot class (e.g. 10 for class 33) N + 1 0 M − N − 1 . . . 0 . . . M − 2 0 2 M − 1 0 1 M = maximum number of receive “reserved for Omitted timeslots for Alternative EFTA future use” Multislot class (e.g. 16 for class 24) - Although the above has been described with reference to certain specific embodiments, various modifications thereof will be apparent to those skilled in the art without departing from the scope of the claims appended hereto.
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EP2387280B1 (en) | 2017-08-30 |
EP2387280A1 (en) | 2011-11-16 |
US8565148B2 (en) | 2013-10-22 |
CN106851832B (en) | 2020-12-22 |
AU2011252726A1 (en) | 2012-12-06 |
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